Locking device for sliding doors



New 20, 1951 J. w. PATTQN LOCKING DEVICE FOR SLIDING DOORS Filed Jan.25, 1948 2 SHEETSSHEET l m2 7 V I20 mi ORNEY V INVENTOR John M. PaflbwBY Nov. 20, 1951 J. w. PATTON LOCKING DEVICE FOR SLIDING DOORS 2SHEETS-SI-IEET 2 Filed Jan. 23, 1948 INVENTOR Jbim WPaflon ATTO EY IPatented Nov. 20, 1951 2,575,465 LOCKING DEVICE FOR SLIDING Dooits''-John W. Patton,- Philadelphia, Pa assignor to American Car andFoundry Company, New York, N; Y., a corporation of New JerseyApplication January 23, 1948, Serial No. 4,030

- 2 Claims.-

1 This invention relates to sliding door locking devices of the type inwhich latch mechanism normally engageable to yieldably hold the doorclosed is positively retained against disengageemergency.

duced to a minimum.

taken on the line 2-2 of Figure 10.

Figure l.

ing device.

. 2 I Figure' 7 is a view similar to Figure 5, but showing a slightlymodified form of the invention.

Figure 8 is a view similar to Figure 6 of the ment by a slidable doggingbolt to lock the door. 5 modification shown in Figure 7.

This type of locking device is adapted for use Figure 9 is a view takenon the line 99 of generally on sliding doors, including sleeping carFigure 7. room doors. It is especially important in the Figure 10 is anend View of the door taken case of sleeping car room doors to avoidposon line I 0-40 of Figure 1 showing the locking sible injury topassengers and their clothing or 10 device applied thereto; and luggageby parts of the locking device projecta Figure 11 is a detachedperspective view of ing into the doorway when open. Further, it is theslidable dogging bolt used with the modifidesirable that such devices beof simple concation shown in Figures 7, 8 and 9. struction, easy tooperate and as nearly as pos- Referring now more in detail tothedrawings, sible failure proof. However, in the event of 15 the lockingdevice is shown as applied to a door failure, quick and easy access tothe-interior of A adapted to slide to closed position against a thedevice should bepossible in order to permit door jamb B. The door jambis cut away as operation from outside the room in cases of indicated atI2 to receive a casting 4 having i a recess l6 formed with an inclinedwall [8 and It is an object of the invention to provide a an abutment 20Pivotally mounted on a pin 22 locking device of the type described whichwill within the recess 16 is a hook-shaped latch memmeet theaforementioned requirements. ber 24 formed with a shoulder 26 normallybear- Another object of the invention is the proviing against abutment20 of the casting l4 to limit sion of such a device which is locatedsubstandownward pivotal movement of the latch so as to tially entirelywithin the edge outlines of the retain it in operative position shown inFigure 1. door and door frame to prevent injury to persons The latch 24is resiliently held against moveor objects passing through the opendoorway. ment from its operative position by a compres- A further'objectof the invention is to provide sion spring 28 held in place between aspring a locking device of the kind described, of simseat 30 formed inthe recess wall I8 and a boss ple construction and operation and inwhich the 30 32 provided on the latch. The latch 24 is thus possibilityof failure of the parts has been repivotally mounted to swing downwardlyby gravity, its movement in that direction being limited A still furtherobject ofthe invention is the by abutment 20 and shoulder 26 acting asstop provision of such a locking device provided with means while itsupward movement is limited by an easily removable cover plate affordingquick the inclined wall It and top wall 33 of the reaccess to theinterior of the device to permit cess l6. This arrangement assures thatthe latch emergency operation from outside of the door. 24 will alwaysbe retained in operative position These and other objects of theinvention will even though the spring 28 should fail or be rebe apparentto those skilled in the art to which moved for any reason. The castingI4 is seit appertains from a study of the following decured by screws 34to the door jamb, which is scription and accompanying drawings in which:grooved as Shown at 6 o e e the tongued Figure 1 is a broken sectionalside view of the edge portion 38 of the sliding door A, thus formlockingdevice with the door in open position. ing a seal between the door andjamb. Figure 2 is a sectional plan view of the device The sliding door Ais cut out as shown at 40 to receive a casting generally indicated at 42Figure 3 is a view taken on the line 3-3 of having a side wall 44, frontwall 46, short rear wall 48 and top and bottom walls 50 and 52, Figure 4is a detached perspective view of the respectively. The casting 42 isfitted in place slidable dogging bolt forming part of the lockwith itsside wall 44 on the inside or room side 50 of the door and forming theinside finish plate Figure 5 is a view similar to Figure 1, but for thatpart of the locking device on the door. showing the device in doorlocking position. Formed integral with or otherwise secured to theFigure 6 is a side elevational view showing'the front wall 46 of thecasting 42 is a hoop-shaped door in open position, a portion of the doorbolt 54 of the proper size and shape to cooperate 55 with and engage thepivoted latch 24 to yield'ably jamb being removed to more clearlydisclose other parts of the device. 1

hold the door A in closed position. When the door A is closed againstthe jamb B the bolt 54 will be engaged under latch 24, the weight of thelatch and pressure of spring 28 acting to hold the (1001 closed butyielding upon opening force being applied to the door.

The latch 24 and bolt 54 are locked against disengagement to hold thedoor in locked position by a slidable doggingbolt 55 shown detached fromthe device in Figure 4. The dogging bolt is formed with an elongatedslot 58 through which extends a pin 60 carried by the side wall 44 ofthe casting 42, and a reduced end portion -62 extended through anopening 54in front wall 46 of casting 42. The dogging boltisthusslidablysupported by pin 60 and iront wall 46 'of the casting, being movablebetween a withdrawn position and a position extending into the recess I6of the door jamb B when the dooris closed for engagement with the flattop surface 66 of latch '24 to lock it in-engagement with the :bolt 54.Pivotally mounted-onpin-Gil is acheck plate 68 formed with an opening ofsuch shape as to provide a depending wedge-shaped detent l engaging asimilarly shaped lug I2 projecting from the clogging bolt 56 through theopening in plate 68. The detent Ill and lug I2 are resiliently retainedin operative engagement by a spring 14 having one end anchored to .plate68 and its other end portion restrained under a ledge 16 formed on thedogging bolt 56. It will be'seen that duringmovementof the dogging boltbetween withdrawn and extended positions the detent it will ride on lugI2 against the'action of spring T4,'the detent III being engageable withopposite faces of the wedge-shaped lug 12 to releasably retain thedogging bolt in either .of its positions. The outer side of the casting42 is closed by a removable cover plate 18 secured in place by screws 80against ribs 82 and inset bearing portions 84 formed integral with thecasting 42. The detent plate 68 is retained against displacement fromoperative position by a projection 85 formed on the plate andmaintaining it in spaced relationto thecover plate 18.

The device as shown in Figures 1, 2, 3, -andr6, in which n used the typeof dogging boltcshown in Figure 4, is operated from the inside or roomside of the door A bya rotatably'mounted knob 8-8. The knob has a shank-90 screw'threaded into the side wall 44 of casting 42 and a square stem92 non-rotatably engaged with a sleeve:94 journalled in cover plate 1.8.The sleeve 94 is formed with a radially-extending cylindrical portion-96received in a curved groove 98.formed.in the-dogging bolt 55. It willthus bezseen that-the dogging bolt 56 may be moved from one position tothe other byturning the knob 88.

The device as shown in Figures 7, 8 and 9 is the same as previouslydescribed except'that a different type of operating means is :used,requiring a dogging bolt as shown-in Figure .11. In thisslightrnodification of the invention the dogging bolt 56 is actuatedby aslidableknob I00 having a shank I62 slidably arranged .in an elongatedslot IE4 formedin side wall 44 of the casting 42. A stem H16projectingfromtheshank extends through a hole I08 in the dogging boltand issecuredthereto by a screw H0. The dogging bolt may thus be movedto and from door locking position by sliding of the knob Illil.

'Both types of dogging bolts as-shown in Figures 4 and 11 maybe-unlocked'from outside of the door by use of a key through the keyhole 'il2iormed in the coverplate 18. The key is inserted over a stud H4secured toside wall =44 of casting 42 and turned until it engages thenotch H6 formed in the dogging bolt. Further turning of the key willthen withdraw the bolt from looking position.

A removable finish plate H8 is applied to the outside of the door A byscrews I20 extending through the door and connected in any suit--.able.manner :to the side wall 44 of casting 42. The side wall of thecasting serves as the inside l finish plate for the locking device andsince this is secured by the screws I20 to the removable iinishplate IfBthe casting or casing 42 housing the locking device is firmly held inposition in the door. The :i'inish plate H8 is of course also formedwith a 'key hole aligned with the key hole I12 in cover plate 18, andwhich is enclosed by 'the'keyhole plate I22. The sliding doorenisopenedand closed from inside the room by a handle [24 and from the outside bythe hand grips I26.

It will be seen that a locking device for sliding .doors has beenprovided which is of strong yet simple construction, easy to operate,andin which the partsare located substantially entirely within theedgeoutlines of the door and ,jamb, thus reducing to a minimum thelikelihood of injury to persons or objects passing through the opendoorway. The mounting of latch 24 with its downward pivotal movementlimited by engagement of shoulder 26 with abutment 20 assures that thelatch will be retained in operative position even though the spring 28shouldiail. In addition, should it be necessary to quickly unlock thedoor from the outside, as incaseof emergency, andthe key-is.unavailableor fails to operate, the finish plate I I8 and cover plate.18 are easily removable, to permit direct manual withdrawal fromlooking position of the dogging bolt 56.

While the invention has been described more or less in detail,.it willbe obvious to those skilled in the art that various modifications may bemade, and all such modifications are contemplated as will .fall withinthe scope of the appended claims defining my invention.

What is .claimedis:

1. .In alocking device for sliding doors, means forming twoseparable;casings, a rigid bolt fixed within oneof said casings, a pivotallymounted latch housed within the other :casing, said :rigid bolt andlatch having cooperating surfaces so formed as to be engageable toyieldably hold the door closed and -.disengageable by opening movementof the door,:an abutment in the casing that houses the .latch "locatedbelow-the pivotal axis thereof, a shoulder on saidlatch engageable withsaid abutment to prevent the latch from dropping below its operativeposition, resilient meansseated in a wall of the casin above .the latch,constantly urgin the latter towards operative position, a-dogging-boltslidably mounted .in said one casing horizontally movable between awithdrawn position therein and a position where it extends into "theother of said casings when the door is closed toengage over the top ofsaid latch, a check plate pivotally mounted on an inner wall :of saidone casing and associated withthe-dogg'ing :bolt and .:having an openingto provide a depending wedge-shaped detent, a wedge-shaped lugprojecting from said dogging bolt through the opening in said checkplate for slidable and 'oooperable engagement with the lug tovreleasablyretain the doggin ibolt in :either of its saiii positions, :said .detentriding over said lug during movement'of the dogging bolt from oneposition to the other to lift the check plate for selectivelypositioning the detent on either side of the lug, and resilient meansconstantly urging said detent and projecting lu into cooperativeengagement.

2. A locking device for sliding doors comprising, means forming twoseparable casings, a rigid bolt located within one of said casings, alatch pivotally mounted in the other casing, said bolt and latch beingadapted to engage upon closing movement of the door to yieldably holdthe latter in closed position and to be disengaged by opening movementof said door, a dogging bolt mounted for horizontal sliding movementfrom a withdrawn position within said one casing to a position extendinginto the other casing when the door is closed to engage over said latchand lock it against movement, a check plate pivotally mounted on aninner wall of said one casin and being formed with an opening providinga depending wedge-shaped detent, said dogging bolt having a wedge-shapedlug projecting therefrom through the opening in said check plate tocooperatively engage said detent and formed with a ledge, saidprojecting lug sliding underneath said detent during movement of thedogging bolt from one position to the other to raise the check plate forselectively engaging said detent on opposite sides of the lug toreleasably retain the doggin bolt in either of its respective positions,and a compression spring having one end anchored in said check plate andits other end engaged beneath said ledge on the dogging bolt forconstantly urging said detent and lug into cooperative engagement.

JOHN W. PATTON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 165,847 McClymonds July 20, 1875913,459 Bily Feb. 23, 1909 922,675 Day May 25, 1909 1,482,788 FreysingerFeb. 5, 1924 1,596,242 Dunn Aug. 17, 1926 2,044,622 Michauka June 16,1936 2,190,485 Rossman Feb. 13, 1940

